commit 041194f54df398f9b3fa12c5326e9da7c8ea94a5
Author: Juergen Spitzmueller <[email protected]>
Date:   Thu May 7 13:05:11 2026 +0200

    Fix cell background drawing for non-centered aligned cells
    
    (cherry picked from commit d470d4224baed5ee84b24cbbef4e2fd2d7c4d7aa)
---
 src/insets/InsetTabular.cpp | 27 +++++++++++++++++++++++++--
 src/insets/InsetTabular.h   |  4 ++++
 status.25x                  |  2 ++
 3 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/src/insets/InsetTabular.cpp b/src/insets/InsetTabular.cpp
index 0560a48815..033e5c6dca 100644
--- a/src/insets/InsetTabular.cpp
+++ b/src/insets/InsetTabular.cpp
@@ -1333,7 +1333,7 @@ int Tabular::cellWidth(idx_type cell) const
        int w = 0;
        col_type const span = columnSpan(cell);
        col_type const col = cellColumn(cell);
-       for(col_type c = col; c < col + span ; ++c)
+       for (col_type c = col; c < col + span ; ++c)
                w += column_info[c].width;
        return w;
 }
@@ -4978,7 +4978,29 @@ void InsetTableCell::draw(PainterInfo & pi, int x, int 
y) const
        int const w = width;
        int const h = mr_rows * (tm.height() + 2 * topOffset(pi.base.bv) + 
bottomOffset(pi.base.bv) + Painter::thin_line);
        int const yframe = y - mr_rows * (tm.ascent()) - mr_rows * 
(Painter::thin_line) - topOffset(pi.base.bv);
-       int const xframe = (isVarwidth) ? x : x - (w - tm.width()) / 2 + 
leftOffset(pi.base.bv);
+       // xframe depends on alignment if not varwidth
+       int xframe = x;
+       switch (contentAlign) {
+       case LYX_ALIGN_CENTER:
+               xframe = (isVarwidth) ? x
+                                     : x - text_h_offset;
+               break;
+       case LYX_ALIGN_NONE:
+       case LYX_ALIGN_BLOCK:
+       case LYX_ALIGN_LEFT:
+               xframe = x - leftOffset(pi.base.bv);
+               break;
+       case LYX_ALIGN_RIGHT:
+               xframe = (isVarwidth) ? x + rightOffset(pi.base.bv) + 
Painter::thin_line
+                                     : x - text_h_offset;
+               break;
+       case LYX_ALIGN_DECIMAL:
+               xframe = x - text_h_offset;
+               break;
+       case LYX_ALIGN_LAYOUT:
+       case LYX_ALIGN_SPECIAL:
+               break;
+       }
 
        if (pi.full_repaint)
                pi.pain.fillRectangle(xframe, yframe, w, h,
@@ -5340,6 +5362,7 @@ void InsetTabular::draw(PainterInfo & pi, int x, int y) 
const
                        drawCellLines(pi, nx, yy, r, idx);
                        nx += tabular.cellWidth(idx);
                        pi.selected = original_selection_state;
+                       
tabular.cell_info[r][c].inset->setTextHOffset(tabular.textHOffset(tabular.cellIndex(r,
 c)));
                        
tabular.cell_info[r][c].inset->setWidth(tabular.cellWidth(tabular.cellIndex(r, 
c)));
                }
 
diff --git a/src/insets/InsetTabular.h b/src/insets/InsetTabular.h
index b385ba8346..ffb489c1f2 100644
--- a/src/insets/InsetTabular.h
+++ b/src/insets/InsetTabular.h
@@ -84,6 +84,8 @@ public:
        ///
        void setWidth(int i) { width = i; }
        ///
+       void setTextHOffset(int i) { text_h_offset = i; }
+       ///
        void setContentAlignment(LyXAlignment al) { contentAlign = al; }
        ///
        void setBackgroundColor(std::string const & col) { background_color = 
col; }
@@ -151,6 +153,8 @@ private:
        ///
        int width = 0;
        ///
+       int text_h_offset = 0;
+       ///
        bool isCaptionRow = false;
        ///
        LyXAlignment contentAlign = LYX_ALIGN_CENTER;
diff --git a/status.25x b/status.25x
index a5fb4c3716..884e4fef2c 100644
--- a/status.25x
+++ b/status.25x
@@ -76,6 +76,8 @@ What's new
 
 - Fix casing of strings in English localization (bug 13304).
 
+- Fix background color drawing for non-center aligned tabular cells.
+
 
 * INTERNALS
 
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