[patch] Win32: moving mouse won't make it appear

[Ken Takata]

Hi,

I have fixed the following issue from the todo.txt:

> 8   Win32: When mouse is hidden and in the toolbar, moving it won't make it
>     appear. (Sami Salonen)

It was the same for the tabline.

HandleMouseHide() is called inside the main WndProc. However, when
moving mouse in the toolbar or the tabline, mouse events are not
sent to the main WndProc. So we have to hook the events using
SubclassWindow().
Please check the attached patch.

Actually, it is also the same for scrollbars, but it seems a little bit
difficult to fix because Vim can have two or more scrollbars.

Regards,
Ken Takata

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# HG changeset patch
# Parent 6fae52d7f74eaf5252eff8b6ddc3d921fb545cab

diff --git a/src/gui_w32.c b/src/gui_w32.c
--- a/src/gui_w32.c
+++ b/src/gui_w32.c
@@ -483,11 +483,13 @@
 static int	s_usenewlook;	    /* emulate W95/NT4 non-bold dialogs */
 #ifdef FEAT_TOOLBAR
 static void initialise_toolbar(void);
+static LRESULT CALLBACK toolbar_wndproc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
 static int get_toolbar_bitmap(vimmenu_T *menu);
 #endif
 
 #ifdef FEAT_GUI_TABLINE
 static void initialise_tabline(void);
+static LRESULT CALLBACK tabline_wndproc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
 #endif
 
 #ifdef FEAT_MBYTE_IME
@@ -4305,10 +4307,22 @@
 		    TOOLBAR_BUTTON_HEIGHT,
 		    sizeof(TBBUTTON)
 		    );
+    s_toolbar_wndproc = SubclassWindow(s_toolbarhwnd, toolbar_wndproc);
 
     gui_mch_show_toolbar(vim_strchr(p_go, GO_TOOLBAR) != NULL);
 }
 
+    static LRESULT CALLBACK
+toolbar_wndproc(
+    HWND hwnd,
+    UINT uMsg,
+    WPARAM wParam,
+    LPARAM lParam)
+{
+    HandleMouseHide(uMsg, lParam);
+    return CallWindowProc(s_toolbar_wndproc, hwnd, uMsg, wParam, lParam);
+}
+
     static int
 get_toolbar_bitmap(vimmenu_T *menu)
 {
@@ -4385,6 +4399,7 @@
 	    WS_CHILD|TCS_FOCUSNEVER|TCS_TOOLTIPS,
 	    CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
 	    CW_USEDEFAULT, s_hwnd, NULL, s_hinst, NULL);
+    s_tabline_wndproc = SubclassWindow(s_tabhwnd, tabline_wndproc);
 
     gui.tabline_height = TABLINE_HEIGHT;
 
@@ -4392,6 +4407,17 @@
     set_tabline_font();
 # endif
 }
+
+    static LRESULT CALLBACK
+tabline_wndproc(
+    HWND hwnd,
+    UINT uMsg,
+    WPARAM wParam,
+    LPARAM lParam)
+{
+    HandleMouseHide(uMsg, lParam);
+    return CallWindowProc(s_tabline_wndproc, hwnd, uMsg, wParam, lParam);
+}
 #endif
 
 #if defined(FEAT_OLE) || defined(FEAT_EVAL) || defined(PROTO)
diff --git a/src/gui_w48.c b/src/gui_w48.c
--- a/src/gui_w48.c
+++ b/src/gui_w48.c
@@ -177,10 +177,12 @@
 
 #ifdef FEAT_TOOLBAR
 static HWND		s_toolbarhwnd = NULL;
+static WNDPROC		s_toolbar_wndproc = NULL;
 #endif
 
 #ifdef FEAT_GUI_TABLINE
 static HWND		s_tabhwnd = NULL;
+static WNDPROC		s_tabline_wndproc = NULL;
 static int		showing_tabline = 0;
 #endif