Editor: Don't use filters in the Save dialog on KDE because that make…

…s it very slow

spyder/widgets/editor.py

@@ -24,15 +24,15 @@
 from qtpy.QtCore import (QByteArray, QFileInfo, QObject, QPoint, QSize, Qt,
                          QThread, QTimer, Signal, Slot)
 from qtpy.QtGui import QFont
-from qtpy.QtWidgets import (QAction, QApplication, QFileDialog,QHBoxLayout,
+from qtpy.QtWidgets import (QAction, QApplication, QFileDialog, QHBoxLayout,
                             QMainWindow, QMessageBox, QMenu, QSplitter,
                             QVBoxLayout, QWidget, QListWidget, QListWidgetItem)
 
 # Local imports
 from spyder.config.base import _, DEBUG, STDERR, STDOUT
 from spyder.config.gui import config_shortcut, get_shortcut
 from spyder.config.utils import (get_edit_filetypes, get_edit_filters,
-                                 get_filter)
+                                 get_filter, is_kde_desktop, is_anaconda)
 from spyder.py3compat import qbytearray_to_str, to_text_string
 from spyder.utils import icon_manager as ima
 from spyder.utils import (codeanalysis, encoding, sourcecode,
@@ -1570,13 +1570,22 @@ def select_savename(self, original_filename):
             self.edit_filetypes = get_edit_filetypes()
         if self.edit_filters is None:
             self.edit_filters = get_edit_filters()
-        selectedfilter = get_filter(self.edit_filetypes,
-                                    osp.splitext(original_filename)[1])
+
+        # Don't use filters on KDE to not make the dialog incredible
+        # slow
+        # Fixes issue 4156
+        if is_kde_desktop() and not is_anaconda():
+            filters = ''
+            selectedfilter = ''
+        else:
+            filters = self.edit_filters
+            selectedfilter = get_filter(self.edit_filetypes,
+                                        osp.splitext(original_filename)[1])
 
         self.redirect_stdio.emit(False)
         filename, _selfilter = getsavefilename(self, _("Save file"),
                                     original_filename,
-                                    filters=self.edit_filters,
+                                    filters=filters,
                                     selectedfilter=selectedfilter,
                                     options=QFileDialog.HideNameFilterDetails)
         self.redirect_stdio.emit(True)