gui/options-dialog: prevent crap key text from being saved

Unprintable characters won't work in addition to not displaying right.
This happens with altgr diacritics on the Polish keyboard on Linux.

Skip all key text with unprintable characters, as if the key was getting
unbound.

1 files changed, 15 insertions, 1 deletions

diff --git a/gui/options-dialog.cpp b/gui/options-dialog.cpp
index 42b5cc52..18b434c4 100644
--- a/gui/options-dialog.cpp
+++ b/gui/options-dialog.cpp
@@ -180,7 +180,21 @@ void OptionsDialog::bind_key(key_opts& kopts, QLabel* label)
     pause_keybindings(true);
     k->exec();
     pause_keybindings(false);
-    label->setText(kopts_to_string(kopts));
+    const bool is_crap = progn(
+        for (const QChar& c : kopts.keycode())
+            if (!c.isPrint())
+                return true;
+        return false;
+    );
+    if (is_crap)
+    {
+        kopts.keycode = QStringLiteral("");
+        kopts.guid = QStringLiteral("");
+        kopts.button = -1;
+        label->setText(tr("None"));
+    }
+    else
+        label->setText(kopts_to_string(kopts));
 }
 
 void OptionsDialog::doOK()