Fix the position of elements after SetColumnWidth called

Also fix the minsize for the scroller which was ignoring the value
Fixes fyne-io#1951

widget/table.go

@@ -508,7 +508,20 @@ func (r *tableCellsRenderer) MinSize() fyne.Size {
 	} else {
 		fyne.LogError("Missing Length callback required for Table", nil)
 	}
-	return fyne.NewSize(r.cells.cellSize.Width*float32(cols)+float32(cols-1), r.cells.cellSize.Height*float32(rows)+float32(rows-1))
+
+	width := float32(0)
+	cellWidth := r.cells.cellSize.Width
+	for col := 0; col < cols; col++ {
+		colWidth, ok := r.cells.t.columnWidths[col]
+		if ok {
+			width += colWidth
+		} else {
+			width += cellWidth
+		}
+	}
+
+	separatorSize := theme.SeparatorThicknessSize()
+	return fyne.NewSize(width+float32(cols-1)*separatorSize, r.cells.cellSize.Height*float32(rows)+float32(rows-1)*separatorSize)
 }
 
 func (r *tableCellsRenderer) Refresh() {
@@ -556,12 +569,12 @@ func (r *tableCellsRenderer) Refresh() {
 				if c == nil {
 					continue
 				}
-
-				c.Move(fyne.NewPos(theme.Padding()+cellOffset,
-					theme.Padding()+float32(row)*(r.cells.cellSize.Height+separatorThickness)))
-				c.Resize(fyne.NewSize(colWidth-theme.Padding()*2, r.cells.cellSize.Height-theme.Padding()*2))
 			}
 
+			c.Move(fyne.NewPos(theme.Padding()+cellOffset,
+				theme.Padding()+float32(row)*(r.cells.cellSize.Height+separatorThickness)))
+			c.Resize(fyne.NewSize(colWidth-theme.Padding()*2, r.cells.cellSize.Height-theme.Padding()*2))
+
 			if updateCell != nil {
 				updateCell(TableCellID{row, col}, c)
 			}

widget/table_test.go

@@ -267,15 +267,21 @@ func TestTable_SetColumnWidth(t *testing.T) {
 				obj.(*Label).Text = "placeholder"
 			}
 		})
-	table.SetColumnWidth(0, 16)
+	table.SetColumnWidth(0, 32)
 	table.Resize(fyne.NewSize(120, 120))
 	table.Select(TableCellID{1, 0})
 
 	renderer := test.WidgetRenderer(table).(*tableRenderer)
 	cellRenderer := test.WidgetRenderer(renderer.scroll.Content.(*tableCells))
 	cellRenderer.Refresh()
 	assert.Equal(t, 8, len(cellRenderer.Objects()))
+	assert.Equal(t, float32(32), cellRenderer.(*tableCellsRenderer).Objects()[0].Size().Width)
+	cell1Offset := theme.SeparatorThicknessSize()+theme.Padding()*3
+	assert.Equal(t, float32(32)+cell1Offset, cellRenderer.(*tableCellsRenderer).Objects()[1].Position().X)
+
+	table.SetColumnWidth(0, 16)
 	assert.Equal(t, float32(16), cellRenderer.(*tableCellsRenderer).Objects()[0].Size().Width)
+	assert.Equal(t, float32(16)+cell1Offset, cellRenderer.(*tableCellsRenderer).Objects()[1].Position().X)
 
 	w := test.NewWindow(table)
 	defer w.Close()