[canvas- graph-] combine resetBounds and refresh

And recalculate/redraw more of the graph view after changes like
zooming/moving.

visidata/canvas.py

@@ -544,13 +544,14 @@ def fixPoint(self, plotterPoint, canvasPoint):
         'adjust visibleBox.xymin so that canvasPoint is plotted at plotterPoint'
         self.visibleBox.xmin = canvasPoint.x - self.canvasW(plotterPoint.x-self.plotviewBox.xmin)
         self.visibleBox.ymin = canvasPoint.y - self.canvasH(plotterPoint.y-self.plotviewBox.ymin)
-        self.refresh()
+        self.resetBounds()
 
     def zoomTo(self, bbox):
         'set visible area to bbox, maintaining aspectRatio if applicable'
         self.fixPoint(self.plotviewBox.xymin, bbox.xymin)
         self.xzoomlevel=bbox.w/self.canvasBox.w
         self.yzoomlevel=bbox.h/self.canvasBox.h
+        self.resetBounds()
 
     def incrZoom(self, incr):
         self.xzoomlevel *= incr
@@ -702,10 +703,11 @@ def refresh(self):
 
     def render(self, h, w):
         'resets plotter, cancels previous render threads, spawns a new render'
-        self.needsRefresh = False
         vd.cancelThread(*(t for t in self.currentThreads if t.name == 'plotAll_async'))
         self.labels.clear()
         self.resetCanvasDimensions(h, w)
+        self.resetBounds()         # sets needsRefresh to True
+        self.needsRefresh = False  # must not happen before resetBounds()
         self.render_async()
 
     @asyncthread
@@ -798,7 +800,7 @@ def deleteSourceRows(self, rows):
 
 Canvas.addCommand('-', 'zoomout-cursor', 'tmp=cursorBox.center; incrZoom(options.disp_zoom_incr); fixPoint(plotviewBox.center, tmp)', 'zoom out from cursor center')
 Canvas.addCommand('+', 'zoomin-cursor', 'tmp=cursorBox.center; incrZoom(1.0/options.disp_zoom_incr); fixPoint(plotviewBox.center, tmp)', 'zoom into cursor center')
-Canvas.addCommand('_', 'zoom-all', 'sheet.canvasBox = None; sheet.visibleBox = None; sheet.xzoomlevel=sheet.yzoomlevel=1.0; resetBounds(); refresh()', 'zoom to fit full extent')
+Canvas.addCommand('_', 'zoom-all', 'sheet.canvasBox = None; sheet.visibleBox = None; sheet.xzoomlevel=sheet.yzoomlevel=1.0; resetBounds()', 'zoom to fit full extent')
 Canvas.addCommand('z_', 'set-aspect', 'sheet.aspectRatio = float(input("aspect ratio=", value=aspectRatio)); refresh()', 'set aspect ratio')
 
 # set cursor box with left click

visidata/graph.py

@@ -27,7 +27,7 @@ def fixPoint(self, plotterPoint, canvasPoint):
         'adjust visibleBox.xymin so that canvasPoint is plotted at plotterPoint'
         self.visibleBox.xmin = canvasPoint.x - self.canvasW(plotterPoint.x-self.plotviewBox.xmin)
         self.visibleBox.ymin = canvasPoint.y - self.canvasH(self.plotviewBox.ymax-plotterPoint.y)
-        self.refresh()
+        self.resetBounds()
 
     def rowsWithin(self, plotter_bbox):
         return super().rowsWithin(plotter_bbox, invert_y=True)
@@ -36,6 +36,7 @@ def zoomTo(self, bbox):
         super().zoomTo(bbox)
         self.fixPoint(Point(self.plotviewBox.xmin, self.plotviewBox.ymin),
                       Point(bbox.xmin, bbox.ymax + 1/4*self.canvasCharHeight))
+        self.resetBounds()
 
     def scaleY(self, canvasY) -> int:
         'returns a plotter y coordinate for a canvas y coordinate, with the y direction inverted'
@@ -122,7 +123,6 @@ def reload(self):
 
         self.xzoomlevel=self.yzoomlevel=1.0
         self.resetBounds()
-        self.refresh()
 
     def draw(self, scr):
         windowHeight, windowWidth = scr.getmaxyx()