comctl32/edit: Notify IME on caret position, format_rect and font changes.

dlls/comctl32/edit.c

@@ -38,6 +38,7 @@
 #include "windef.h"
 #include "winbase.h"
 #include "winnt.h"
+#include "wingdi.h"
 #include "imm.h"
 #include "usp10.h"
 #include "commctrl.h"
@@ -1697,6 +1698,20 @@ static LRESULT EDIT_EM_Scroll(EDITSTATE *es, INT action)
 }
 
 
+static void EDIT_UpdateImmCompositionWindow(EDITSTATE *es, UINT x, UINT y)
+{
+    COMPOSITIONFORM form =
+    {
+        .dwStyle = CFS_RECT,
+        .ptCurrentPos = {.x = x, .y = y},
+        .rcArea = es->format_rect,
+    };
+    HIMC himc = ImmGetContext(es->hwndSelf);
+    ImmSetCompositionWindow(himc, &form);
+    ImmReleaseContext(es->hwndSelf, himc);
+}
+
+
 /*********************************************************************
  *
  *	EDIT_SetCaretPos
@@ -1712,6 +1727,7 @@ static void EDIT_SetCaretPos(EDITSTATE *es, INT pos,
         res = EDIT_EM_PosFromChar(es, pos, after_wrap);
         TRACE("%d - %dx%d\n", pos, (short)LOWORD(res), (short)HIWORD(res));
         SetCaretPos((short)LOWORD(res), (short)HIWORD(res));
+        EDIT_UpdateImmCompositionWindow(es, (short)LOWORD(res), (short)HIWORD(res));
     }
 }
 
@@ -3728,6 +3744,15 @@ static DWORD get_font_margins(HDC hdc, const TEXTMETRICW *tm)
 	return MAKELONG(left, right);
 }
 
+static void EDIT_UpdateImmCompositionFont(EDITSTATE *es)
+{
+    LOGFONTW composition_font;
+    HIMC himc = ImmGetContext(es->hwndSelf);
+    GetObjectW(es->font, sizeof(LOGFONTW), &composition_font);
+    ImmSetCompositionFontW(himc, &composition_font);
+    ImmReleaseContext(es->hwndSelf, himc);
+}
+
 /*********************************************************************
  *
  *	WM_SETFONT
@@ -3779,6 +3804,8 @@ static void EDIT_WM_SetFont(EDITSTATE *es, HFONT font, BOOL redraw)
 				 es->flags & EF_AFTER_WRAP);
 		ShowCaret(es->hwndSelf);
 	}
+
+	EDIT_UpdateImmCompositionFont(es);
 }
 
 
@@ -4593,6 +4620,7 @@ static LRESULT CALLBACK EDIT_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPAR
     EDITSTATE *es = (EDITSTATE *)GetWindowLongPtrW(hwnd, 0);
     LRESULT result = 0;
     RECT *rect;
+    POINT pt;
 
     TRACE("hwnd %p, msg %#x, wparam %Ix, lparam %Ix\n", hwnd, msg, wParam, lParam);
 
@@ -5048,6 +5076,9 @@ static LRESULT CALLBACK EDIT_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPAR
 
     /* IME messages to make the edit control IME aware */
     case WM_IME_SETCONTEXT:
+        GetCaretPos(&pt);
+        EDIT_UpdateImmCompositionWindow(es, pt.x, pt.y);
+        EDIT_UpdateImmCompositionFont(es);
         break;
 
     case WM_IME_STARTCOMPOSITION: