richedit: Clear non-default style when changing to plain text mode.

[Dylan Smith]

Although the text must be empty for the mode to change to plain text
mode, there still may be a non-default style for the temporary insert
style and style for the end of text run.  This patch makes sure these
aren't used when changing to plain text mode.
---
 dlls/riched20/editor.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/dlls/riched20/editor.c b/dlls/riched20/editor.c
index 48b64c9..aace0ea 100644
--- a/dlls/riched20/editor.c
+++ b/dlls/riched20/editor.c
@@ -4332,6 +4332,18 @@ LRESULT ME_HandleMessage(ME_TextEditor *editor, UINT msg, WPARAM wParam,
     {
       mask |= TM_RICHTEXT | TM_PLAINTEXT;
       changes |= wParam & (TM_RICHTEXT | TM_PLAINTEXT);
+      if (wParam & TM_PLAINTEXT) {
+        /* Clear selection since it should be possible to select the
+         * end of text run for rich text */
+        ME_InvalidateSelection(editor);
+        ME_SetCursorToStart(editor, &editor->pCursors[0]);
+        editor->pCursors[1] = editor->pCursors[0];
+        /* plain text can only have the default style. */
+        ME_ClearTempStyle(editor);
+        ME_AddRefStyle(editor->pBuffer->pDefaultStyle);
+        ME_ReleaseStyle(editor->pCursors[0].pRun->member.run.style);
+        editor->pCursors[0].pRun->member.run.style = editor->pBuffer->pDefaultStyle;
+      }
     }
     /* FIXME: Currently no support for undo level and code page options */
     editor->mode = (editor->mode & ~mask) | changes;
-- 
1.7.2.3