https://bugs.kde.org/show_bug.cgi?id=471046

            Bug ID: 471046
           Summary: Bug in the brush stroke after using Mirror Screen
                    Vertically; Brush duplicated, on the other side of the
                    screen.
    Classification: Applications
           Product: krita
           Version: 5.1.5
          Platform: unspecified
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: CPU Canvas
          Assignee: krita-bugs-n...@kde.org
          Reporter: spark...@yandex.com
  Target Milestone: ---

SUM:
Strokes in two parts of the screen after use Image > Mirror Image Horizontally,
when using the eraser.


STEPS TO REPRODUCE
1. Go Image > Mirror Image Horizontally
2. Then go back to previous, original mirroring, Image > Mirror Image
Horizontally again
3. Now use the eraser in the left side of the canvas

OBSERVED RESULT
the erasing affect also the right side of the screen, too, reaching two places
at the same time.

EXPECTED RESULT
the erasing should happen only where the cursor would pass over.

SOFTWARE/OS VERSIONS
Windows: 10

ADDITIONAL INFORMATION
OpenGL Info

  Vendor:  "Google Inc. (AMD)" 
  Renderer:  "ANGLE (AMD, Radeon(TM) RX 460 Graphics Direct3D11 vs_5_0 ps_5_0,
D3D11-31.0.12027.9001)" 
  Version:  "OpenGL ES 3.0.0 (ANGLE 2.1.0 git hash:
f2280c0c5f93+krita_qt5.12.12)" 
  Shading language:  "OpenGL ES GLSL ES 3.00 (ANGLE 2.1.0 git hash:
f2280c0c5f93+krita_qt5.12.12)" 
  Requested format:  QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24,
redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8,
stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer,
swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile 
QSurfaceFormat::CompatibilityProfile) 
  Current format:  QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize 8,
greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8,
samples 0, swapBehavior QSurfaceFormat::DefaultSwapBehavior, swapInterval 0,
colorSpace QSurfaceFormat::DefaultColorSpace, profile 
QSurfaceFormat::NoProfile) 
     Version: 3.0
     Supports deprecated functions false 
     is OpenGL ES: true 
  supportsBufferMapping: true 
  supportsBufferInvalidation: false 
  forceDisableTextureBuffers: true 
  Extensions: 
     "GL_ANGLE_depth_texture" 
     "GL_OES_compressed_ETC2_sRGB8_alpha8_texture" 
     "GL_EXT_texture_storage" 
     "GL_ANGLE_texture_usage" 
     "GL_ANGLE_copy_texture_3d" 
     "GL_EXT_draw_elements_base_vertex" 
     "GL_ANGLE_get_tex_level_parameter" 
     "GL_EXT_texture_format_BGRA8888" 
     "GL_EXT_texture_norm16" 
     "GL_ANGLE_base_vertex_base_instance" 
     "GL_ANGLE_base_vertex_base_instance_shader_builtin" 
     "GL_EXT_map_buffer_range" 
     "GL_CHROMIUM_copy_texture" 
     "GL_EXT_robustness" 
     "GL_EXT_texture_compression_dxt1" 
     "GL_EXT_multisampled_render_to_texture" 
     "GL_OES_draw_elements_base_vertex" 
     "GL_OES_element_index_uint" 
     "GL_OES_depth24" 
     "GL_NV_EGL_stream_consumer_external" 
     "GL_ANGLE_client_arrays" 
     "GL_OES_EGL_image_external_essl3" 
     "GL_EXT_color_buffer_half_float" 
     "GL_EXT_texture_compression_s3tc_srgb" 
     "GL_OES_compressed_EAC_RG11_unsigned_texture" 
     "GL_OES_compressed_ETC2_punchthroughA_RGBA8_texture" 
     "GL_OES_draw_buffers_indexed" 
     "GL_EXT_debug_marker" 
     "GL_OES_compressed_ETC2_sRGB8_texture" 
     "GL_OES_texture_border_clamp" 
     "GL_OES_texture_stencil8" 
     "GL_OES_compressed_ETC2_RGB8_texture" 
     "GL_EXT_read_format_bgra" 
     "GL_EXT_occlusion_query_boolean" 
     "GL_EXT_texture_filter_anisotropic" 
     "GL_NV_pixel_buffer_object" 
     "GL_ANGLE_lossy_etc_decode" 
     "GL_EXT_blend_func_extended" 
     "GL_ANGLE_framebuffer_blit" 
     "GL_OES_texture_npot" 
     "GL_ANGLE_request_extension" 
     "GL_CHROMIUM_sync_query" 
     "GL_OES_compressed_ETC2_punchthroughA_sRGB8_alpha_texture" 
     "GL_OES_texture_float_linear" 
     "GL_CHROMIUM_copy_compressed_texture" 
     "GL_OES_compressed_EAC_R11_signed_texture" 
     "GL_EXT_EGL_image_external_wrap_modes" 
     "GL_OES_get_program_binary" 
     "GL_ANGLE_multiview_multisample" 
     "GL_EXT_clip_control" 
     "GL_EXT_debug_label" 
     "GL_EXT_shader_texture_lod" 
     "GL_OES_compressed_ETC2_RGBA8_texture" 
     "GL_EXT_sRGB" 
     "GL_KHR_parallel_shader_compile" 
     "GL_CHROMIUM_bind_uniform_location" 
     "GL_EXT_instanced_arrays" 
     "GL_NV_framebuffer_blit" 
     "GL_OES_surfaceless_context" 
     "GL_OES_texture_half_float_linear" 
     "GL_CHROMIUM_lose_context" 
     "GL_ANGLE_translated_shader_source" 
     "GL_ANGLE_texture_compression_dxt5" 
     "GL_EXT_draw_buffers" 
     "GL_ANGLE_texture_compression_dxt3" 
     "GL_EXT_texture_type_2_10_10_10_REV" 
     "" 
     "GL_OES_vertex_array_object" 
     "GL_EXT_unpack_subimage" 
     "GL_NV_pack_subimage" 
     "GL_EXT_draw_buffers_indexed" 
     "GL_EXT_float_blend" 
     "GL_EXT_texture_compression_rgtc" 
     "GL_NV_fence" 
     "GL_ANGLE_get_serialized_context_string" 
     "GL_OES_compressed_EAC_RG11_signed_texture" 
     "GL_OVR_multiview2" 
     "GL_EXT_texture_compression_bptc" 
     "GL_ANGLE_provoking_vertex" 
     "GL_CHROMIUM_bind_generates_resource" 
     "GL_AMD_performance_monitor" 
     "GL_OES_mapbuffer" 
     "GL_ANGLE_texture_multisample" 
     "GL_EXT_blend_minmax" 
     "GL_ANGLE_pack_reverse_row_order" 
     "GL_ANGLE_multi_draw" 
     "GL_WEBGL_video_texture" 
     "GL_ANGLE_program_cache_control" 
     "GL_OES_packed_depth_stencil" 
     "GL_OES_rgb8_rgba8" 
     "GL_OVR_multiview" 
     "GL_ANGLE_memory_size" 
     "GL_ANGLE_framebuffer_multisample" 
     "GL_EXT_color_buffer_float" 
     "GL_ANGLE_robust_client_memory" 
     "GL_EXT_multi_draw_indirect" 
     "GL_KHR_debug" 
     "GL_OES_texture_half_float" 
     "GL_EXT_disjoint_timer_query" 
     "GL_OES_fbo_render_mipmap" 
     "GL_OES_standard_derivatives" 
     "GL_OES_depth32" 
     "GL_EXT_texture_rg" 
     "GL_EXT_frag_depth" 
     "GL_ANGLE_instanced_arrays" 
     "GL_OES_EGL_image" 
     "GL_OES_EGL_image_external" 
     "GL_OES_compressed_EAC_R11_unsigned_texture" 
     "GL_EXT_discard_framebuffer" 
     "GL_OES_texture_float" 

QPA OpenGL Detection Info 
  supportsDesktopGL: true 
  supportsAngleD3D11: true 
  isQtPreferAngle: true 

useBufferInvalidation (config option): false


Hardware Information

  GPU Acceleration: auto
  Memory: 6107 Mb
  Number of Cores: 8
  Swap Location: C:/Users/PC/AppData/Local/Temp
  Built for: sse2
  Base instruction set: sse2
  Supported instruction sets: sse4.2 sse4.1 ssse3 sse3 sse2 

Current Settings

  Current Swap Location: C:/Users/PC/AppData/Local/Temp
  Current Swap Location writable: true
  Undo Enabled: true
  Undo Stack Limit: 200
  Use OpenGL: true
  Use OpenGL Texture Buffer: true
  Disable Vector Optimizations: false
  Disable AVX Optimizations: false
  Canvas State: OPENGL_SUCCESS
  Autosave Interval: 420
  Use Backup Files: true
  Number of Backups Kept: 1
  Backup File Suffix: ~
  Backup Location: Same Folder as the File
  Backup Location writable: false
  Resource Location: C:/Users/PC/AppData/Roaming/krita
  Use Win8 Pointer Input: false
  Use RightMiddleTabletButton Workaround: false
  Levels of Detail Enabled: false
  Use Zip64: false


Loaded Python Plugins
        colorspace
        comics_project_management_tools
        documenttools
        exportlayers
        filtermanager
        lastdocumentsdocker
        plugin_importer
        quick_settings_docker
        scripter
        tenbrushes
        tenscripts


Display Information
Number of screens: 1
        Screen: 0
                Name: \\.\DISPLAY1
                Depth: 32
                Scale: 1
                Physical DPI49.6621
                Logical DPI96
                Physical Size: 697, 392
                Position: 0, 0
                Resolution in pixels: 1360x768
                Manufacturer: 
                Model: 
                Refresh Rate: 60


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