Extend input method check for gcin (#3315)

* add @changhc to author list

* check against unsupported im only

* Apply clang-format


Co-authored-by: Henry Heino <hheino@uw.edu>

AUTHORS

@@ -58,6 +58,7 @@ Henrik Dick <hen-di@web.de>
 Henry Heino <46334387+personalizedrefrigerator@users.noreply.github.com>
 Henry Heino <personalizedrefrigerator@gmail.com>
 Holzfeind, Daniel Georg <git@holzfeind.net>
+Huan-Cheng Chang <hello@changhc.me>
 Jan Hrdina <jan.hrdka@gmail.com>
 Jason Vander Woude <jasonvwoude@gmail.com>
 John Doe <johndoe@0.0>

src/control/XournalMain.cpp

@@ -384,9 +384,12 @@ using XMPtr = XournalMainPrivate*;
 /// Checks for input method compatibility and ensures it
 void ensure_input_model_compatibility() {
     const char* imModule = g_getenv("GTK_IM_MODULE");
-    if (imModule != nullptr && strcmp(imModule, "xim") == 0) {
-        g_setenv("GTK_IM_MODULE", "ibus", true);
-        g_warning("Unsupported input method: xim, changed to: ibus");
+    if (imModule != nullptr) {
+        std::string imModuleString{imModule};
+        if (imModuleString == "xim" || imModuleString == "gcin") {
+            g_setenv("GTK_IM_MODULE", "ibus", true);
+            g_warning("Unsupported input method: %s, changed to: ibus", imModule);
+        }
     }
 }