Made centering the buffer in the window optional

It causes jitter while resizing in floating wms

backends/x/event.go

@@ -39,13 +39,18 @@ func (backend *Backend) handleConfigureNotify (
 		width, height := backend.calculateBufferSize()
 		backend.application.SetSize(width, height)
 
-		// position buffer in the center of the screen
-		frameWidth  := width  * backend.metrics.cellWidth
-		frameHeight := height * backend.metrics.cellHeight
-		backend.metrics.paddingX =
-			(backend.metrics.windowWidth - frameWidth) / 2
-		backend.metrics.paddingY =
-			(backend.metrics.windowHeight - frameHeight) / 2
+		if backend.config.Center() {
+			// position buffer in the center of the screen
+			frameWidth  := width  * backend.metrics.cellWidth
+			frameHeight := height * backend.metrics.cellHeight
+			backend.metrics.paddingX =
+				(backend.metrics.windowWidth - frameWidth) / 2
+			backend.metrics.paddingY =
+				(backend.metrics.windowHeight - frameHeight) / 2
+		} else {
+			backend.metrics.paddingX = backend.metrics.padding
+			backend.metrics.paddingY = backend.metrics.padding
+		}
 
 		backend.windowBoundsClean = false
 	}

config.go

@@ -12,6 +12,7 @@ import "path/filepath"
 type Config struct {
 	colors   [8]color.Color
 	padding  int
+	center   bool
 	fontSize int
 	fontName string
 }
@@ -29,6 +30,13 @@ func (config *Config) Padding () (padding int) {
 	return
 }
 
+// Center returns whether the buffer should be displayed in the center of the
+// window like in kitty, or aligned to one corner like in gnome-terminal.
+func (config *Config) Center () (center bool) {
+	center = config.center
+	return
+}
+
 // FontSize specifies how big the font should be.
 func (config *Config) FontSize () (fontSize int) {
 	fontSize = config.fontSize
@@ -98,8 +106,14 @@ func (config *Config) loadFile (path string) {
 		}
 		key   = strings.TrimSpace(key)
 		value = strings.TrimSpace(value)
+
 		var valueInt int
 		var valueColor color.Color
+		var valueBoolean bool
+		
+		if value == "true" {
+			valueBoolean = true
+		}
 
 		if value[0] == '#' {
 			if len(value) != 7  {
@@ -134,6 +148,8 @@ func (config *Config) loadFile (path string) {
 			config.fontSize = valueInt
 		case "padding":
 			config.padding = valueInt
+		case "center":
+			config.center = valueBoolean
 		case "colorBackground":
 			config.colors[ColorBackground] = valueColor
 		case "colorForeground":