Pinyin: not mix upper and lower case

We should not change the original input text.

Fixes: QTBUG-85245
Change-Id: Idfbe95102f9e60a08d78fec5791b9fb2a5a2e817
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
(cherry picked from commit 9b4a16c2e5882343b7632061990d3af42f3716eb)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/plugins/pinyin/plugin/pinyininputmethod.cpp b/src/plugins/pinyin/plugin/pinyininputmethod.cpp
index be69df59..8c379770 100644
--- a/src/plugins/pinyin/plugin/pinyininputmethod.cpp
+++ b/src/plugins/pinyin/plugin/pinyininputmethod.cpp
@@ -229,12 +229,12 @@ public:
             activeCmpsLen = activeCmpsLen - (surface.length() - surfaceDecodedLen);
             composingStrDisplay = fullSent.mid(0, fixedLen);
             for (int pos = fixedLen + 1; pos < splStart.size() - 1; pos++) {
-                composingStrDisplay += surface.mid(splStart[pos], splStart[pos + 1] - splStart[pos]).toUpper();
+                composingStrDisplay += surface.mid(splStart[pos], splStart[pos + 1] - splStart[pos]);
                 if (splStart[pos + 1] < surfaceDecodedLen)
                     composingStrDisplay += QLatin1String(" ");
             }
             if (surfaceDecodedLen < surface.length())
-                composingStrDisplay += surface.mid(surfaceDecodedLen).toLower();
+                composingStrDisplay += surface.mid(surfaceDecodedLen);
         }
         q->inputContext()->setPreeditText(composingStrDisplay);