Fix issue where temporary binaries would be left

Fixes #1910

CHANGELOG.md

@@ -25,6 +25,8 @@ More detailed release notes can be found on the [releases page](https://github.c
 * Add internet permission by default for Android apps (#1715)
 * Child and Parent support in storage were missing for mobile appps
 * Various crashes with Entry and multiline selections (including #1989)
+* Slider calls OnChanged for each value between steps (#1748)
+* fyne command doesn't remove temporary binary from src (#1910)
 
 
 ## 2.0.1 - 4 March 2021

cmd/fyne/commands/package.go

@@ -3,6 +3,7 @@ package commands
 import (
 	"flag"
 	"fmt"
+	"log"
 	"strconv"
 	"strings"
 
@@ -105,6 +106,7 @@ func (p *packager) doPackage() error {
 		if !util.Exists(p.exe) {
 			return fmt.Errorf("unable to build directory to expected executable, %s", p.exe)
 		}
+		defer p.removeBuild()
 	}
 
 	switch p.os {
@@ -123,6 +125,13 @@ func (p *packager) doPackage() error {
 	}
 }
 
+func (p *packager) removeBuild() {
+	err := os.Remove(p.exe)
+	if err != nil {
+		log.Println("Unable to remove temporary build file", p.exe)
+	}
+}
+
 func (p *packager) validate() error {
 	if p.os == "" {
 		p.os = targetOS()