Disallow setting grid block rows/columns to zero (#65217)

* Disallow setting grid block rows/columns to zero

* Prevent issues with grid block column/row count by ensuring a proper minimum

Co-authored-by: talldan <talldanwp@git.wordpress.org>
Co-authored-by: andrewserong <andrewserong@git.wordpress.org>
Co-authored-by: mirka <0mirka00@git.wordpress.org>

packages/block-editor/src/layouts/grid.js

@@ -74,7 +74,8 @@ export default {
 		// In the experiment we want to also show column control in Auto mode, and
 		// the minimum width control in Manual mode.
 		const showColumnsControl =
-			window.__experimentalEnableGridInteractivity || layout?.columnCount;
+			window.__experimentalEnableGridInteractivity ||
+			!! layout?.columnCount;
 		const showMinWidthControl =
 			window.__experimentalEnableGridInteractivity ||
 			! layout?.columnCount;
@@ -317,7 +318,7 @@ function GridLayoutColumnsAndRowsControl( {
 									const defaultNewColumnCount =
 										isManualPlacement ? 1 : undefined;
 									const newColumnCount =
-										value === ''
+										value === '' || value === '0'
 											? defaultNewColumnCount
 											: parseInt( value, 10 );
 									onChange( {
@@ -327,7 +328,7 @@ function GridLayoutColumnsAndRowsControl( {
 								} else {
 									// Don't allow unsetting the column count.
 									const newColumnCount =
-										value === ''
+										value === '' || value === '0'
 											? 1
 											: parseInt( value, 10 );
 									onChange( {
@@ -337,7 +338,7 @@ function GridLayoutColumnsAndRowsControl( {
 								}
 							} }
 							value={ columnCount }
-							min={ 0 }
+							min={ 1 }
 							label={ __( 'Columns' ) }
 							hideLabelFromVision={
 								! window.__experimentalEnableGridInteractivity ||
@@ -355,7 +356,7 @@ function GridLayoutColumnsAndRowsControl( {
 								onChange={ ( value ) => {
 									// Don't allow unsetting the row count.
 									const newRowCount =
-										value === ''
+										value === '' || value === '0'
 											? 1
 											: parseInt( value, 10 );
 									onChange( {
@@ -364,21 +365,24 @@ function GridLayoutColumnsAndRowsControl( {
 									} );
 								} }
 								value={ rowCount }
-								min={ 0 }
+								min={ 1 }
 								label={ __( 'Rows' ) }
 							/>
 						) : (
 							<RangeControl
 								__next40pxDefaultSize
 								__nextHasNoMarginBottom
-								value={ columnCount ?? 0 }
+								value={ columnCount ?? 1 }
 								onChange={ ( value ) =>
 									onChange( {
 										...layout,
-										columnCount: value,
+										columnCount:
+											value === '' || value === '0'
+												? 1
+												: value,
 									} )
 								}
-								min={ 0 }
+								min={ 1 }
 								max={ 16 }
 								withInputField={ false }
 								label={ __( 'Columns' ) }