[help- sidebar-] prevent sidebar flicker #2630

The change to drawSidebarText() fixes flicker of the cursor
next to the sidebar title. The change to HelpPane.draw() fixes
flicker in the title of the 'Input Keystrokes Help' pane.

Author: midichef

visidata/help.py

@@ -135,7 +135,7 @@ def draw(self, scr, x=None, y=None, **kwargs):
         self.scr.erase()
         self.scr.box()
         self.amgr.draw(self.scr, y=1, x=2, **kwargs)
-        self.scr.refresh()
+        self.scr.noutrefresh()
 
 
 @VisiData.api

visidata/sidebar.py

@@ -191,7 +191,7 @@ def drawSidebarText(sheet, scr, text:Union[None,str,'HelpPane'], title:str='', o
     if bottommsg:
         clipdraw(sidebarscr, h-1, winw-dispwidth(bottommsg)-4, '|'+bottommsg+'|', cattr)
 
-    sidebarscr.refresh()
+    sidebarscr.noutrefresh()
 
 
 @VisiData.api