fix: don't resize terminal when hidden

src/element.js

@@ -90,6 +90,8 @@ class XTerminalElementImpl extends HTMLElement {
 			// resized due to the pane resizing or due to the entire window
 			// resizing.
 			this.mainDivResizeObserver = new ResizeObserver((entries, observer) => {
+				const lastEntry = entries.pop()
+				this.mainDivContentRect = lastEntry.contentRect
 				this.refitTerminal()
 			})
 			this.mainDivResizeObserver.observe(this.mainDiv)
@@ -678,7 +680,12 @@ class XTerminalElementImpl extends HTMLElement {
 
 	refitTerminal () {
 		// Only refit the terminal when it is completely visible.
-		if (this.terminalDivInitiallyVisible) {
+		if (
+			this.terminalDivInitiallyVisible &&
+			this.mainDivContentRect &&
+			this.mainDivContentRect.width > 0 &&
+			this.mainDivContentRect.height > 0
+		) {
 			this.fitAddon.fit()
 			const geometry = this.fitAddon.proposeDimensions()
 			if (geometry && this.isPtyProcessRunning()) {