Patch from Shinsaku Nakagawa. Fixes two IME problems:

1. The font of IME is not changed when option changed.
   (Option->TextEditor->General->Font)
2. The location of IME is not occasionally correct.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@555 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Libraries/ICSharpCode.TextEditor/Project/Src/Gui/Caret.cs

@@ -249,10 +249,10 @@ namespace ICSharpCode.TextEditor
 				if (ime == null) {
 					ime = new Ime(textArea.Handle, textArea.Document.TextEditorProperties.Font);
 				} else {
+					ime.HWnd = textArea.Handle;
 					ime.Font = textArea.Document.TextEditorProperties.Font;
 				}
-				ime.SetIMEWindowLocation(pos.X + 2,
+				ime.SetIMEWindowLocation(pos.X, pos.Y);
-				                         pos.Y);
 				
 				currentPos = pos;
 			}

src/Libraries/ICSharpCode.TextEditor/Project/Src/Gui/Ime.cs

@@ -18,7 +18,8 @@ namespace ICSharpCode.TextEditor
 	{
 		public Ime(IntPtr hWnd, Font font)
 		{
-			hIMEWnd = ImmGetDefaultIMEWnd(hWnd);
+			this.hWnd = hWnd;
+			this.hIMEWnd = ImmGetDefaultIMEWnd(hWnd);
 			this.font = font;
 			SetIMEWindowFont(font);
 		}
@@ -37,13 +38,24 @@ namespace ICSharpCode.TextEditor
 			}
 		}
 
+		public IntPtr HWnd
+		{
+			set {
+				if (this.hWnd != value) {
+					this.hWnd = value;
+					this.hIMEWnd = ImmGetDefaultIMEWnd(value);
+					SetIMEWindowFont(font);
+				}
+			}
+		}
+
 		[ DllImport("imm32.dll") ]
 		private static extern IntPtr ImmGetDefaultIMEWnd(IntPtr hWnd);
 
 		[ DllImport("user32.dll") ]
-		private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, COMPOSITIONFORM lParam);
+		private static extern int SendMessage(IntPtr hWnd, int msg, int wParam, COMPOSITIONFORM lParam);
 		[ DllImport("user32.dll") ]
-		private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, LOGFONT lParam);
+		private static extern int SendMessage(IntPtr hWnd, int msg, int wParam, [In, MarshalAs(UnmanagedType.LPStruct)] LOGFONT lParam);
 
 		[ StructLayout(LayoutKind.Sequential) ]
 		private class COMPOSITIONFORM
@@ -71,12 +83,12 @@ namespace ICSharpCode.TextEditor
 
 		private const int WM_IME_CONTROL = 0x0283;
 
-		private const int IMC_SETCOMPOSITIONFONT = 0x000a;
 		private const int IMC_SETCOMPOSITIONWINDOW = 0x000c;
 		private IntPtr hIMEWnd;
+		private IntPtr hWnd;
 		private const int CFS_POINT = 0x0002;
 
-		[ StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto) ]
+		[ StructLayout(LayoutKind.Sequential) ]
 		private class LOGFONT
 		{
 			public int lfHeight = 0;
@@ -94,25 +106,22 @@ namespace ICSharpCode.TextEditor
 			public byte lfPitchAndFamily = 0;
 			[ MarshalAs(UnmanagedType.ByValTStr, SizeConst=32) ] public string lfFaceName = null;
 		}
-		
+		private const int IMC_SETCOMPOSITIONFONT = 0x000a;
-		const byte FF_MODERN = 48;
-		const byte FIXED_PITCH = 1;
 
 		private void SetIMEWindowFont(Font f)
 		{
 			LOGFONT lf = new LOGFONT();
 			f.ToLogFont(lf);
-			lf.lfPitchAndFamily = FIXED_PITCH | FF_MODERN;
+			lf.lfFaceName = f.Name;  // This is very important! "Font.ToLogFont" Method sets invalid value to LOGFONT.lfFaceName
 
 			SendMessage(
 						hIMEWnd,
 						WM_IME_CONTROL,
-			            new IntPtr(IMC_SETCOMPOSITIONFONT),
+						IMC_SETCOMPOSITIONFONT,
 						lf
 						);
 		}
 
-		
 		public void SetIMEWindowLocation(int x, int y)
 		{
 
@@ -128,7 +137,7 @@ namespace ICSharpCode.TextEditor
 			SendMessage(
 						hIMEWnd,
 						WM_IME_CONTROL,
-			            new IntPtr(IMC_SETCOMPOSITIONWINDOW),
+						IMC_SETCOMPOSITIONWINDOW,
 						lParam
 						);
 		}